Estimating nutrient contents of pig slurries rapidly by measurement of physical and chemical properties

摘要: Livestock slurries contain organic matter, nitrogen, phosphorus and potassium, which can be recycled in arable systems; however, excess applications cause pollution problems therefore an estimation of the nutrients is necessary. The aim present experiment was to test methods rapidly estimating nutrient contents pig based on physical chemical analysis. A total 216 samples with a dry matter content range 22·5 91·8 g/kg were collected Beijing during 2003 2004. One part each original sample analysed for properties, such as electrical conductivity (EC), pH specific gravity (SG). other laboratory measure (OM), nitrogen (TN), ammonium (AN), (TP) potassium (TK). Analytical results showed that OM could estimated by single property regression SG (R 2 =0·92, P<0·001), TN multiple =0·86, P<0-001), AN EC =0.82, P<0·001),TP =0.81, TK =0·81, P<0·001).